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WO2018146963A1 - Écran tactile et procédé de fabrication d'écran tactile - Google Patents

Écran tactile et procédé de fabrication d'écran tactile Download PDF

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Publication number
WO2018146963A1
WO2018146963A1 PCT/JP2017/046396 JP2017046396W WO2018146963A1 WO 2018146963 A1 WO2018146963 A1 WO 2018146963A1 JP 2017046396 W JP2017046396 W JP 2017046396W WO 2018146963 A1 WO2018146963 A1 WO 2018146963A1
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WO
WIPO (PCT)
Prior art keywords
touch screen
transparent conductive
conductive film
white
screen according
Prior art date
Application number
PCT/JP2017/046396
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English (en)
Japanese (ja)
Inventor
正好 山内
大屋　秀信
小俣　猛憲
直人 新妻
星野　秀樹
一歩 浦山
Original Assignee
コニカミノルタ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to CN201780085643.2A priority Critical patent/CN110249292A/zh
Priority to JP2018566792A priority patent/JPWO2018146963A1/ja
Publication of WO2018146963A1 publication Critical patent/WO2018146963A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the present invention relates to a touch screen and a touch screen manufacturing method, and more particularly to a touch screen and a touch screen manufacturing method capable of achieving both image quality and sensitivity.
  • Patent Document 1 A touch screen having a touch panel function on a screen for projecting an image from a projector is known.
  • Patent Documents 2 and 3 As a coordinate detection mechanism in a touch screen, a light detection method (Patent Documents 2 and 3), a film resistance method (Patent Document 4), or a capacitance method (Patent Document 5) has been proposed.
  • the image projected on the surface of the touch screen can be clearly displayed by configuring the surface of the touch screen with a white layer.
  • the conductive film can be seen when an image is projected, and the image quality is deteriorated.
  • Patent Documents 1 to 5 do not show a problem regarding the compatibility of image quality and sensitivity as described above, and do not show means for solving this problem.
  • an object of the present invention is to provide a touch screen that can achieve both image quality and sensitivity, and a method for manufacturing the touch screen.
  • the touch screen according to any one of 1 to 4 wherein the transparent conductive film is provided on both surfaces of the substrate, and the white layer is provided on the transparent conductive film on at least one surface. 6). 6.
  • the conductive pattern includes a plurality of thin conductive wires.
  • the thickness of the conductive thin wire gradually decreases toward an edge. 10.
  • a touch screen that can achieve both image quality and sensitivity, and a method for manufacturing the touch screen.
  • the schematic perspective view which notched some touch screens concerning one Embodiment. 1 is a schematic perspective view of the touch screen shown in FIG. 1 as viewed from below.
  • gap in the edge of an electroconductive thin wire The figure explaining an example of conductive thin wire formation
  • the figure explaining the 1st aspect of mesh pattern formation The figure explaining the 2nd aspect of mesh pattern formation
  • the figure explaining the example of bonding of the base material with two transparent conductive films Schematic diagram conceptually explaining an example of a roll-to-roll system
  • FIG. 1 is a schematic perspective view in which a part of a touch screen (a part of a white layer) according to an embodiment is cut out.
  • FIG. 2 is a schematic perspective view of the touch screen shown in FIG. is there.
  • the touch screen is composed of the base material 1, the transparent conductive film 2 provided on both surfaces of the base material 1, and one surface of the base material 1 (the upper surface in FIG. And a white layer 3 provided on the transparent conductive film 2.
  • the transparent conductive film 2 is used as a position detection electrode in a coordinate detection mechanism such as a capacitance method.
  • the transparent conductive film 2 on the front surface serves as a Y-direction sensor
  • the transparent conductive film 2 on the other surface of the substrate 1 (the surface opposite to the above-described surface, also referred to as the back surface for convenience) is X
  • Each is used as a direction sensor.
  • the surface 30 of the white layer 3 is used as a projection surface for projecting an image from the projector and as a touch surface in the coordinate detection mechanism.
  • the transparent conductive film 2 as the conductive film, even when the white layer 3 provided on the transparent conductive film 2 is thinly formed, the transparent conductive film 2 is visually recognized on the surface 30 of the white layer 3. Can be prevented. Thereby, the image quality of a projection image can be improved. Further, since the white layer 3 can be formed thin, it is possible to prevent a decrease in the sensitivity of coordinate detection. As a result, the effect of achieving both image quality and sensitivity is exhibited. For example, in a capacitive touch screen, the capacitance can be increased by forming the white layer 3 thin, so that the effect of improving the sensitivity is suitably exhibited.
  • Substrate 1 is not particularly limited, and for example, a white substrate or a transparent substrate can be used, but a white substrate is particularly preferable.
  • the whiteness exhibited by the substrate 1 can be visually recognized through the transparent conductive film 2. Therefore, the whiteness required for the white layer 3 can be reduced by the whiteness exhibited by the substrate 1, and the white layer 3 can be further thinned. As a result, the sensitivity of coordinate detection can be further improved.
  • the material of the substrate 1 is not particularly limited, and for example, glass, synthetic resin material, and other various materials can be used.
  • Synthetic resin materials include, for example, polyethylene terephthalate (PET) resin, polyethylene naphthalate (PEN) resin, polybutylene terephthalate resin, cellulose resin (polyacetylcellulose, cellulose diacetate, cellulose triacetate, etc.), polyethylene resin, polypropylene Resin, methacrylic resin, cyclic polyolefin resin, polystyrene resin, acrylonitrile- (poly) styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyvinyl chloride resin, poly ( Examples include (meth) acrylic resins, polycarbonate resins, polyester resins, polyimide resins, polyamide resins, and polyamideimide resins.
  • the material of the base material 1 is preferably a synthetic resin material (
  • a method of applying a white pigment to the base material 1 or including a white pigment in the base material 1 can be used.
  • white pigments include white inorganic pigments.
  • the white inorganic pigment include alkaline earth metal sulfates such as barium sulfate, alkaline earth metal carbonates such as calcium carbonate, silicas such as fine silicate and synthetic silicate, calcium silicate, and alumina. , Alumina hydrate, titanium oxide, zinc oxide, talc, clay and the like.
  • a white organic pigment, white hollow polymer fine particles, or the like may be used as the white pigment.
  • the shape of the substrate 1 is not particularly limited, and may be, for example, a plate shape (plate material).
  • a plate material the thickness, size (area), and shape are not particularly limited, and can be appropriately determined according to the use and purpose of the touch screen.
  • the thickness of the plate material is not particularly limited, and can be, for example, about 1 ⁇ m to 10 cm, and further about 20 ⁇ m to 300 ⁇ m.
  • the surface of the substrate 1 on which the transparent conductive film 2 is formed (the surface in contact with the transparent conductive film 2) may be subjected in advance to a surface treatment such as a treatment for changing the surface energy.
  • a surface treatment such as a treatment for changing the surface energy.
  • a substrate in which functional layers such as a hard coat layer and an antireflection layer are laminated may be used as the substrate 1.
  • the transparent conductive film 2 is configured by a conductive pattern.
  • the conductive pattern can be composed of a conductive material continuously applied on the substrate 1 so as to exhibit a two-dimensional pattern.
  • continuous means that the conductive materials are electrically connected to each other in the conductive pattern.
  • the transparent conductive film 2 which consists of one electroconductive pattern can be functioned as one electrode.
  • the transparent conductive film 2 is formed in a strip shape.
  • the plurality of transparent conductive films 2 are arranged side by side at a predetermined interval.
  • the longitudinal direction of the transparent conductive film 2 on the surface of the substrate 1 is provided so as to intersect the longitudinal direction of the transparent conductive film 2 on the back surface of the substrate 1. Thereby, the position in the Y direction and the position in the X direction can be detected by the transparent conductive films 2 on both surfaces of the substrate 1.
  • a lead wire 4 is connected to one end of each transparent conductive film 2.
  • the lead-out wiring 4 extends to an FPC (flexible printed wiring board) connection portion 5.
  • the FPC connection unit 5 constitutes a terminal for connecting an FPC (not shown).
  • the lead-out wiring 4 and the FPC connection portion 5 are made of a conductive material.
  • the FPC can be connected to an arithmetic circuit (also referred to as a touch panel control IC) (not shown) for performing position detection.
  • the conductive pattern of the transparent conductive film 2 is preferably composed of a plurality of conductive thin wires 21.
  • the transparency of the transparent conductive film 2 is improved, and the white layer 3 can be further thinned, so that the effect of the present invention is further improved.
  • the width of the conductive thin wire 21 is preferably 10 ⁇ m or less, more preferably 7 ⁇ m or less, and most preferably 5 ⁇ m or less.
  • the conductivity and flexibility of the transparent conductive film 2 can be suitably achieved as compared with, for example, an ITO solid film.
  • an ITO solid film if the film thickness is increased in order to ensure conductivity, flexibility is likely to be impaired.
  • the transparent conductive film 2 composed of the conductive thin wires 21 has an effect of being excellent in conductivity while maintaining flexibility.
  • the transparent conductive film 2 being “transparent” does not necessarily mean that the conductive material itself constituting the transparent conductive film 2 is transparent, and the transparent conductive film 2 as a whole (for example, in the conductive pattern) It only needs to be able to transmit light (through a region to which no conductive material is applied).
  • the transmittance (total light transmittance) of the transparent conductive film 2 is preferably 85% T or more.
  • the transmittance is a value measured using an AUTOMATIC ZEMETER (MODEL TC-HIIIDP) manufactured by Tokyo Denshoku.
  • Examples of the conductive pattern constituted by the conductive thin wires 21 include, for example, a stripe pattern in addition to the mesh pattern shown in FIG.
  • the transparent conductive film 2 will be described in more detail in “2. Touch Screen Manufacturing Method” below.
  • the white layer 3 is provided on the transparent conductive film 2. Therefore, as described above, even when the white layer 3 provided on the transparent conductive film 2 is thinly formed, the transparent conductive film 2 can be prevented from being visually recognized on the surface 30 of the white layer 3. Thereby, the image quality of a projection image can be improved. Further, since the white layer 3 can be formed thin, it is possible to prevent a decrease in the sensitivity of coordinate detection. As a result, the effect of achieving both image quality and sensitivity is exhibited.
  • the white layer 3 is preferably thin from the viewpoint of improving sensitivity.
  • the white layer 3 is preferably 5 mm or less, 1 mm or less, 100 ⁇ m or less, 50 ⁇ m or less, 30 ⁇ m or less, and more preferably 20 ⁇ m or less.
  • the lower limit of the thickness of the white layer 3 is not particularly limited, but can be set to 1 ⁇ m or more, for example, from the viewpoint of improving durability.
  • the distance from the surface of the transparent conductive film 21 to the surface 30 of the white layer 3 is preferably short, for example, 5 mm or less, 1 mm or less, 100 ⁇ m or less, 50 ⁇ m or less, 30 ⁇ m or less, or 20 ⁇ m.
  • the following is preferable.
  • the lower limit of this distance is not particularly limited, but can be set to 1 ⁇ m or more, for example, from the viewpoint of improving durability.
  • the white layer 3 is preferably a white coating film or a white film, for example, from the viewpoint of imparting good flexibility to the touch screen.
  • the white coating film examples include a layer in which a white pigment is dispersed in a binder.
  • a white pigment what was illustrated as a white pigment which can be contained in a base material in said "(1) base material" can be used.
  • the thickness of the white coating film can be set to 5 ⁇ m to 5 mm, for example.
  • Examples of the white film include a film in which the above-described white pigment is dispersed in a resin.
  • the thickness of the white film can be set to 0.05 mm to 5 mm, for example.
  • the white layer 3 may have a single layer structure or a multilayer structure. From the viewpoint of forming the white layer 3 thin, a single layer structure is preferable.
  • the white layer 3 is preferably provided directly on the transparent conductive film 2. Thereby, the distance from the transparent conductive film 2 to the surface 30 of the white layer 3 is shortened, and in particular, the sensitivity of the capacitive touch screen can be further improved.
  • the white layer 3 is directly provided on the transparent conductive film 2 because no layer (additional function layer) that imparts an additional function is interposed between the transparent conductive film 2 and the white layer 3. It means that.
  • An adhesive layer, an adhesive layer, and the like for providing (holding) the white layer 3 on the transparent conductive film 2 are not additional functional layers.
  • the present invention is aimed at improving the sensitivity of the touch screen, it is not preferable to provide an additional functional layer from the viewpoint of shortening the distance from the transparent conductive film 2 to the surface 30 of the white layer 3.
  • an additional functional layer of the lens layer is interposed between the transparent conductive film 2 and the white layer 3, not only the sensitivity is lowered, but also the viewing angle of the projected image is narrowed or the flexibility is impaired.
  • the versatility of the touch screen may be limited.
  • the white layer 3 is a white coating film, it can be formed in a desired thickness, and since the adhesive layer and the adhesive layer can be omitted, the sensitivity can be improved satisfactorily. Even when a white film is used, the adhesive layer and the adhesive layer can be omitted by thermocompression bonding on the transparent conductive film 2.
  • an adhesive layer or an adhesive layer is provided, if the film thickness is sufficiently thin, for example, 100 ⁇ m or less, and further 60 ⁇ m or less, it is possible to sufficiently prevent a decrease in sensitivity.
  • a transparent material from the viewpoint of preventing deterioration in image quality.
  • a white pigment can be contained in the adhesive layer or the pressure-sensitive adhesive layer so as to be a part of the white layer 3.
  • the white layer 3 will be described in more detail in “2. Touch Screen Manufacturing Method” below.
  • the transparent conductive film 2 composed of a plurality of conductive thin wires 21 is formed on the substrate 1.
  • Examples of the method for forming the conductive thin wires 21 on the substrate 1 include a printing method and photolithography, and the printing method is particularly preferably used.
  • the conductive thin wire 21 can be formed by applying an ink containing a conductive material onto the substrate 1.
  • the white layer 3 is directly provided on the transparent conductive film 2, it is preferable to form the transparent conductive film 2 by a printing method from the viewpoint of improving the adhesion of the white layer 3. This will be described with reference to FIG.
  • FIG. 3A is a cross-sectional view of the conductive thin wire 21 formed by photolithography, cut along a cross section orthogonal to the longitudinal direction of the conductive thin wire 21.
  • FIG.3 (b) is sectional drawing which cut
  • the white layer 3 provided on the transparent conductive film 2 covers the conductive fine wire 21 and the base material 1 in a region where the conductive fine wire 21 is not provided. It is preferable from the viewpoint of improving the adhesiveness.
  • the thickness of the conductive thin wire 21 formed by photolithography is constant toward the edge and is cut off at the sharp edge. Therefore, when the white layer 3 is provided on this, the space
  • the thickness of the conductive thin wire 21 formed by the printing method is gradually increased toward the edge due to the influence of the surface tension of the ink when the conductive thin wire 21 is formed. getting thin. Therefore, when the white layer 3 is provided thereon, the above-described void C is hardly generated, and an effect of improving the adhesion of the white layer 3 can be obtained.
  • the printing method is preferable from the viewpoint of preventing the generation of the gap C and further improving the image quality.
  • the air gap C can be a cause of non-uniform capacitance. Therefore, the printing method is preferable from the viewpoint of preventing the generation of the gap C and further improving the sensitivity.
  • the printing method is not particularly limited, and examples thereof include a screen printing method, a relief printing method, an intaglio printing method, an offset printing method, a flexographic printing method, an inkjet method, and the like. Among these, an inkjet method is preferable.
  • the droplet discharge method of the inkjet head in the inkjet method is not particularly limited, and examples thereof include a piezo method and a thermal method.
  • a line-shaped liquid 20 made of ink containing a conductive material is applied on the substrate 1.
  • a conductive thin wire 21 can be formed as shown in FIG. 4B by selectively depositing a conductive material on the edge of the line liquid 20 in the course of drying the line liquid 20.
  • a pair of conductive thin wires 21 and 21 are formed by selectively depositing a conductive material on both edges along the longitudinal direction of the line-shaped liquid 20.
  • the inner edges of the conductive thin wires 21 and 21 are formed so as to gradually become thinner toward the edges.
  • the line width of the conductive thin wire 21 is narrower than the line width of the line-like liquid 20, and is preferably 10 ⁇ m or less and more preferably 5 ⁇ m or less from the viewpoint of improving the transparency of the transparent conductive film.
  • the lower limit of the line width of the conductive thin wire 3 is not particularly limited, but can be set to, for example, 1 ⁇ m or more from the viewpoint of imparting stable conductivity.
  • Various patterns can be formed by the conductive thin wires 21. Examples of such a pattern include a stripe pattern and a mesh pattern.
  • the first mode of mesh pattern formation will be described with reference to FIG. 5, and then the second mode of mesh pattern formation will be described with reference to FIG.
  • a pair of conductive thin wires 21 and 21 are formed from each line-shaped liquid 20 by utilizing the coffee stain phenomenon when the line-shaped liquid 20 is dried.
  • a pair of conductive thin wires 21 and 21 are formed from each line-shaped liquid 20 by utilizing the coffee stain phenomenon when the line-shaped liquid 20 is dried.
  • a mesh pattern can be formed as described above.
  • the line-like liquid 20 and the conductive thin wire 21 are straight, but the present invention is not limited to this.
  • the shape of the line-like liquid 20 and the conductive thin wire 21 may be, for example, a wavy line or a broken line. Since the conductive thin wire 21 has a non-linear shape such as a wavy line or a broken line, an effect of preventing disconnection can be obtained even when the touch screen is curved.
  • a thin line unit composed of a pair of conductive thin wires 21, 21 is formed from each line-shaped liquid 20 by utilizing the coffee stain phenomenon when the line-shaped liquid 20 is dried.
  • the conductive thin wires 21 and 3 are formed concentrically, with one (outside conductive thin wire 21) including the other (inner conductive thin wire 21) inside.
  • the conductive thin wires 21 and 21 each have a quadrangular shape corresponding to the shape of both edges (inner peripheral edge and outer peripheral edge) of the line-shaped liquid 20.
  • a line-shaped liquid 20 having a plurality of quadrangles arranged in parallel in the longitudinal direction and the width direction of the substrate 1 is formed on the substrate 1.
  • the line-shaped liquid 20 which comprises a some square is formed in the position pinched
  • the line-shaped liquid 20 having a quadrangular shape is arranged so as to be in contact with the outer conductive thin wire 21 of the thin wire units adjacent thereto, but not in contact with the inner conductive thin wire 21.
  • a thin line unit composed of a pair of conductive thin wires 21 and 21 is formed from each line-shaped liquid 20 using the coffee stain phenomenon when the line-shaped liquid 20 is dried. Further form.
  • the outer conductive thin wires 21 are connected to the adjacent outer conductive thin wires 21.
  • the inner conductive thin wire 21 is not connected to the other inner conductive thin wire 21 and the outer conductive thin wire 21. That is, the inner conductive thin wires 21 are arranged so as to be isolated.
  • the pattern shown in FIG. 6D may be used as a mesh pattern as it is.
  • the inner conductive thin wires 21 in the pattern shown in FIG. 6D may be removed to form a mesh pattern (FIG. 6E) composed of the outer conductive thin wires 21.
  • FIG. 6E a mesh pattern
  • an effect that the conductive thin wire 21 can be formed with a high degree of freedom is obtained.
  • the method of removing the inner conductive thin wire 21 is not particularly limited, and for example, a method of irradiating energy rays such as laser light or a method of chemically etching can be used.
  • the inner conductive thin wire 21 is disposed so as to be isolated, and can be excluded from the energization path for applying electrolytic plating to the outer conductive thin wire 21. Therefore, while the outer conductive thin wire 21 is subjected to electrolytic plating (while energized), the inner conductive thin wire 21 that is not subjected to electrolytic plating can be removed by dissolution or decomposition with a plating solution. it can.
  • the line-shaped liquid 20 and the conductive thin wire 21 are rectangular, but the present invention is not limited to this.
  • the shapes of the line-like liquid 20 and the conductive thin wires 21 include closed geometric figures.
  • the closed geometric figure include polygons such as a triangle, a quadrangle, a hexagon, and an octagon.
  • the closed geometric figure may include a curved element such as a circle or an ellipse.
  • the conductive material contained in the ink is not particularly limited, and examples thereof include conductive fine particles and conductive polymers.
  • Examples of the conductive fine particles include metal fine particles, metal oxide fine particles, and carbon fine particles. Among these, metal fine particles are preferable, and thereby the conductivity of the transparent conductive film can be improved and the sensitivity can be further improved.
  • the metal constituting the metal fine particle examples include Au, Pt, Ag, Cu, Ni, Cr, Rh, Pd, Zn, Co, Mo, Ru, W, Os, Ir, Fe, Mn, Ge, Sn, Ga, In etc. are mentioned. Among these, Au, Ag, and Cu are preferable, and Ag is particularly preferable.
  • the average particle diameter of the metal fine particles can be, for example, 1 to 100 nm, further 3 to 50 nm.
  • the average particle diameter is a volume average particle diameter, and can be measured by “Zeta Sizer 1000HS” manufactured by Malvern.
  • metal oxide fine particles examples include indium tin oxide (ITO).
  • Examples of the carbon fine particles include graphite fine particles, carbon nanotubes, fullerenes and the like.
  • the conductive polymer is not particularly limited, but a ⁇ -conjugated conductive polymer can be preferably exemplified.
  • Examples of the ⁇ -conjugated conductive polymer include polythiophenes and polyanilines.
  • the ⁇ -conjugated conductive polymer may be used together with a polyanion such as polystyrene sulfonic acid.
  • the concentration of the conductive material in the ink can be, for example, 5% by weight or less, and can be 0.01% by weight or more and 1.0% by weight or less. As a result, the coffee stain phenomenon is promoted, and effects such as further narrowing of the conductive thin wire can be obtained.
  • the solvent used in the ink is not particularly limited, and may include one or more selected from water and organic solvents.
  • the organic solvent include 1,2-hexanediol, 2-methyl-2,4-pentanediol, 1,3-butanediol, 1,4-butanediol, alcohols such as propylene glycol, diethylene glycol monomethyl ether,
  • ethers such as diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, and dipropylene glycol monoethyl ether.
  • the ink can contain other components such as a surfactant.
  • the surfactant is not particularly limited, and examples thereof include a silicon surfactant.
  • the concentration of the surfactant in the ink can be, for example, 1% by weight or less.
  • the drying method of the ink (line liquid) applied on the substrate may be natural drying or forced drying.
  • the drying method used for forced drying is not particularly limited. For example, a method of heating the surface of the substrate to a predetermined temperature, a method of forming an air flow on the surface of the substrate, or the like can be used alone or in combination. .
  • the airflow can be formed by blowing or sucking using a fan or the like, for example.
  • a post-treatment can be applied to the conductive fine wire formed on the substrate.
  • a baking process, a plating process, etc. are mentioned, for example. After performing the baking treatment, a plating treatment may be performed.
  • Examples of the baking treatment include light irradiation treatment and heat treatment.
  • light irradiation treatment for example, gamma rays, X-rays, ultraviolet rays, visible light, infrared rays (IR), microwaves, radio waves, and the like can be used.
  • heat treatment for example, hot air, a heating stage, a heating press, or the like can be used.
  • plating treatment examples include electroless plating and electrolytic plating.
  • the conductive thin wire can be selectively plated using the conductivity of the conductive thin wire.
  • the surface of the transparent conductive film made of conductive thin wires can be formed of a plating film.
  • Conductive thin wires may be subjected to multiple plating processes. A plurality of times of plating processes using different plating metals may be performed. A plurality of metal layers (plated films) can be laminated on the conductive thin wire by a plurality of times of plating treatment.
  • a plurality of metal layers plated films
  • When laminating a plurality of metal layers by laminating a first metal layer made of copper and a second metal layer made of nickel or chromium on the conductive thin wires in order, The effect of improving weather resistance by chromium and the effect of eliminating the color can be obtained. The image quality can be further improved by eliminating the color of the conductive thin wire.
  • an oxidizing agent such as sodium persulfate, cupric chloride, hydrogen peroxide and the like may be included in the plating solution used for electrolytic plating.
  • the conductivity of the conductive fine wire can be improved and the plating thickness can be suppressed. This effect is exhibited particularly well when a conductive thin wire formed using the coffee stain phenomenon is targeted.
  • a method of bonding two substrates with a transparent conductive film having a transparent conductive film formed on one side may be used.
  • the base material 1 of the base material with one transparent conductive film is opposed to the base material 1 of the base material with the other transparent conductive film. Can be pasted together.
  • the base material 1 of one base material with a transparent conductive film and the transparent conductive film 2 of the other base material with a transparent conductive film can be made to oppose and can be bonded together.
  • the white layer which consists of a white coating film layer can be formed by providing a white ink on a transparent conductive film.
  • the printing method those exemplified as the method for forming the transparent conductive film in “2. Touch Screen Manufacturing Method (1) Formation of Transparent Conductive Film” described above can be used.
  • the white ink can contain a white pigment.
  • a white pigment what was illustrated as a white pigment which can be contained in a base material in said "1. touch screen (1) base material" can be used.
  • a white layer can be formed by applying the ink onto the transparent conductive film and then drying the solvent.
  • the solvent-based ink may contain a binder component such as resin fine particles.
  • a white layer can be formed by applying the ink onto the transparent conductive film and then irradiating the active energy ray to cure the curable component.
  • the cured curable component functions as a binder in the white layer.
  • active energy rays include ultraviolet rays and infrared rays.
  • the concentration and particle diameter of the white pigment in the white ink are not particularly limited, and appropriate ones can be used as appropriate.
  • the average particle size of the white pigment can be set to, for example, 300 nm or less from the viewpoint of preventing nozzle clogging.
  • the average particle diameter is a volume average particle diameter, and can be measured by “Zeta Sizer 1000HS” manufactured by Malvern.
  • the white layer when the white layer is formed by a printing method, the white layer can be formed with a desired thickness by adjusting the amount of white ink applied. Furthermore, since the adhesive layer and the pressure-sensitive adhesive layer can be suitably omitted, the sensitivity can be further improved. Further, when the printing method is used, an effect of preventing the generation of the gap C described with reference to FIG. 3 can be obtained.
  • the printing method it is particularly preferable to use an inkjet method.
  • a thin white layer can be formed with uniform thickness, and image quality and sensitivity can be further improved. Further, the generation of the gap C can be prevented more reliably.
  • a white layer made of a white film can be formed by bonding a white film on a transparent conductive film.
  • the white film can be bonded through an adhesive layer or an adhesive layer.
  • the adhesive layer or the pressure-sensitive adhesive layer may be formed by coating, or may be formed by a film such as an adhesive sheet or a pressure-sensitive adhesive sheet.
  • thermocompression bonding a white film on a transparent conductive film may be used.
  • the adhesive layer or the pressure-sensitive adhesive layer can be suitably omitted.
  • the white layer may be formed by using both the printing method and film bonding.
  • the second white layer may be formed on the first white layer by film bonding. In this way, a white layer having a multilayer structure may be formed.
  • the manufacturing method at the time of manufacturing a touch screen is not specifically limited, It is preferable to perform the process from formation of a transparent conductive film to formation of a white layer by a roll to roll system. Thereby, the effect which improves manufacturing efficiency is acquired.
  • a long base material wound in a roll shape is used, and the base material fed from the upstream roll 6 is formed into a transparent conductive film. It can convey to the area 7 and the white layer formation area 8 sequentially, and can wind up the base material in which the transparent conductive film and the white layer were formed to the roll 9 of the downstream.
  • the transparent conductive film is provided on both surfaces of the base material and the white layer is provided on the transparent conductive film on one surface is mainly shown, but the present invention is not limited to this.
  • a white layer may be provided on the transparent conductive films on both sides of the substrate.
  • whiteness required for the white layer on the front surface side of the base material can be reduced, and the white layer on the front surface side of the base material can be further thinned. Thereby, further sensitivity improvement can be achieved.
  • the transparent conductive film on the back surface of the substrate may be omitted.
  • the position detection electrodes in the Y direction and the X direction can be configured by the transparent conductive film on the surface of the base material.
  • the Y direction and the X direction described with respect to the transparent conductive film do not necessarily need to be in a perpendicular relationship, and may be crossed. Further, the Y direction and the X direction are not limited to being oriented in a specific direction in the product. Further, the coordinate detection by the touch screen does not necessarily need to detect coordinates in a plurality of coordinate systems (two in the case of the Y direction and the X direction), and may detect coordinates in one coordinate system. Good.
  • the transparent conductive film 2 the lead-out wiring 4, and the FPC connection part 5 similar to those shown in FIG. Specifically, in the same manner as the first aspect of the mesh pattern formation described with reference to FIG. 5, a belt-like shape made of a mesh pattern is formed on the surface of the base material 1 made of a transparent PET film with an easy adhesion layer having a thickness of 125 ⁇ m. A plurality of transparent conductive films 2 were formed. In order to form the line-shaped liquid 20, the following ink 1 was used, and the conductive fine wire 21 was formed by utilizing the coffee stain phenomenon.
  • ink 1 The composition of ink 1 is as follows. -Aqueous dispersion of silver nanoparticles (silver nanoparticles: 40% by weight): 1.75% by weight ⁇ Diethylene glycol monobutyl ether: 20% by weight ⁇ Pure water: balance
  • Each transparent conductive film 2 formed on the surface of the substrate 1 is used as a Y direction sensor.
  • the width of the transparent conductive film 2 was 5 mm, and a gap of 0.1 mm was provided between adjacent transparent conductive films 2.
  • the conductive thin wires 21 constituting the transparent conductive film 2 are juxtaposed with an interval of 1 mm.
  • the lead-out wiring 4 (line width 50 ⁇ m) and the FPC connection portion 5 (line width 300 ⁇ m) were printed by the ink jet method using the following ink 2, respectively.
  • ink 2 The composition of ink 2 is as follows. -Aqueous dispersion of silver nanoparticles (silver nanoparticles: 40% by weight): 80% by weight ⁇ 1,2-hexanediol: 20% by weight
  • the transparent conductive film 2, the lead-out wiring 4, and the FPC connection portion 5 similar to those shown in FIG. 2 were formed on the back surface of the substrate 1 in the same manner as described above.
  • Each transparent conductive film 2 formed on the back surface of the substrate 1 is used as an X direction sensor.
  • the size of the sensor area formed by the Y direction sensor and the X direction sensor was 42 inches.
  • the base material 1 on which the transparent conductive film 2, the lead-out wiring 4 and the FPC connection portion 5 were formed on both surfaces was placed in a hot air oven and subjected to a baking treatment at 130 ° C. for 10 minutes.
  • Electrolytic copper plating In a copper plating bath prepared with a formulation in which 60 g of copper sulfate pentahydrate, 19 g of sulfuric acid, 2 g of 1N hydrochloric acid, and 5 g of a gloss-imparting agent ("ST901C" manufactured by Meltex Co., Ltd.) are finished to 1000 ml with ion-exchanged water, Immersion was performed, power was supplied to the transparent conductive film 2, the lead-out wiring 4, and the FPC connection portion 5, and electrolytic copper plating was performed. A copper plate for plating was used for the anode.
  • a gloss-imparting agent (“ST901C” manufactured by Meltex Co., Ltd.)
  • Substrate 1 is immersed in a nickel plating bath prepared with a formulation in which 240 g of nickel sulfate, 45 g of nickel chloride, and 30 g of boric acid are finished to 1000 ml with ion-exchanged water, and transparent conductive film 2, lead-out wiring 4, and FPC connection portion 5.
  • a nickel plate for plating was used for the anode.
  • Example 2 In Example 1, the white layer 3 was formed by using the white ink of screen printing ink 9100PL manufactured by Jujo Chemical Co., Ltd., except that the white layer was formed by a screen printing method so as to have a dry film thickness of 50 ⁇ m. In the same manner, a touch screen was obtained.
  • Example 3 In Example 1, when the white layer 3 was formed, a white PET film having a thickness of 100 ⁇ m was bonded to the transparent conductive film on the surface of the substrate 1 through a transparent adhesive sheet having a thickness of 50 ⁇ m to form a white layer. A touch screen was obtained in the same manner as in Example 1 except that.
  • Example 4 In Example 1, a touch screen was obtained in the same manner as in Example 1 except that a white PET film with an easy adhesion layer having a thickness of 125 ⁇ m was used as the substrate 1.
  • Example 5 a touch screen was obtained in the same manner as in Example 3 except that a white PET film with an easy adhesion layer having a thickness of 125 ⁇ m was used as the substrate 1.
  • Example 6 In Example 1, when the transparent conductive film 2, the lead-out wiring 4 and the FPC connection part 5 were formed, a screen printing method using a silver paste was used, and plating was omitted. Got. The line width of the conductive thin wire 21 constituting the sensor area was 5.3 ⁇ m.
  • Example 7 In Example 1, when forming the transparent conductive film 2, the lead-out wiring 4 and the FPC connection portion 5, the Cu layer deposited on the entire front and back surfaces of the base material 1 is subjected to photolithography to form the transparent conductive film 2 and the lead-out wiring. 4 and FPC connection portion 5 were formed, and a touch screen was obtained in the same manner as in Example 1 except that plating was omitted.
  • the line width of the thin conductive wires 21 constituting the sensor area was 4.9 ⁇ m.
  • Example 6 a touch screen is formed in the same manner as in Example 6 except that the conductive thin wire 21 constituting the transparent conductive film 2 has a line width of 30 ⁇ m (visually visible) to make an opaque conductive film. Got.
  • Example 2 In Example 1, a touch screen was obtained in the same manner as Example 1 except that the formation of the white layer was omitted.
  • Base material 2 Transparent conductive film 3: White layer 4: Lead-out wiring 5: FPC connection part

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
  • Position Input By Displaying (AREA)

Abstract

La présente invention résout le problème de fourniture d'un écran tactile et d'un procédé de fabrication de l'écran tactile pouvant assurer à la fois une qualité d'image et une sensibilité. Le problème est résolu par : un écran tactile ayant un substrat (1), un film conducteur transparent (2) comprenant un motif conducteur disposé sur le substrat (1), et une couche de couleur blanche (3) disposée sur le film conducteur transparent (2); ou par un procédé de fabrication de l'écran tactile par formation du film conducteur transparent (2) comprenant le motif conducteur sur le substrat (1), puis de formation de la couche de couleur blanche (3) sur le film conducteur transparent (2). Le substrat (1) est de préférence blanc.
PCT/JP2017/046396 2017-02-09 2017-12-25 Écran tactile et procédé de fabrication d'écran tactile WO2018146963A1 (fr)

Priority Applications (2)

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CN201780085643.2A CN110249292A (zh) 2017-02-09 2017-12-25 触摸屏以及触摸屏的制造方法
JP2018566792A JPWO2018146963A1 (ja) 2017-02-09 2017-12-25 タッチスクリーン及びタッチスクリーンの製造方法

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JP2011141650A (ja) * 2010-01-06 2011-07-21 Panasonic Corp タッチパネル装置及びその製造方法
JP2012103761A (ja) * 2010-11-05 2012-05-31 Fujifilm Corp タッチパネル
JP2013030378A (ja) * 2011-07-29 2013-02-07 Mitsubishi Paper Mills Ltd 光透過性導電材料
US9152277B1 (en) * 2010-06-30 2015-10-06 Amazon Technologies, Inc. Touchable projection surface system
WO2016194987A1 (fr) * 2015-06-03 2016-12-08 コニカミノルタ株式会社 Capteur de panneau tactile et procédé pour fabriquer un capteur de panneau tactile

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JP5645581B2 (ja) * 2010-10-05 2014-12-24 富士フイルム株式会社 タッチパネル
CN103984461B (zh) * 2011-12-16 2017-09-15 富士胶片株式会社 导电片以及触摸面板
KR101206341B1 (ko) * 2012-02-15 2012-11-29 유흥상 백색코팅층이 형성된 터치스크린 패널
KR101792585B1 (ko) * 2012-08-20 2017-11-02 코니카 미놀타 가부시키가이샤 도전성 재료를 포함하는 평행선 패턴, 평행선 패턴 형성 방법, 투명 도전막을 구비한 기재, 디바이스 및 전자 기기

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011141650A (ja) * 2010-01-06 2011-07-21 Panasonic Corp タッチパネル装置及びその製造方法
US9152277B1 (en) * 2010-06-30 2015-10-06 Amazon Technologies, Inc. Touchable projection surface system
JP2012103761A (ja) * 2010-11-05 2012-05-31 Fujifilm Corp タッチパネル
JP2013030378A (ja) * 2011-07-29 2013-02-07 Mitsubishi Paper Mills Ltd 光透過性導電材料
WO2016194987A1 (fr) * 2015-06-03 2016-12-08 コニカミノルタ株式会社 Capteur de panneau tactile et procédé pour fabriquer un capteur de panneau tactile

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